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Segments Disclosures - Geographic Information (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of geographical areas [line items] |  |  |
Revenues | $ 2,101 | $ 2,347 | $ 2,249
PP&E | 5,822 | 6,207 | 6,164
Right-of-use assets | 141 | 146 | 52
Intangible assets | 313 | 318 | 373
Other assets | 206 | 198 |
Goodwill | 463 | 464 |
Canada |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 1,227 | 1,460 | 1,573
PP&E | 4,661 | 4,854 |
Right-of-use assets | 107 | 109 |
Intangible assets | 185 | 213 |
Other assets | 74 | 75 |
Goodwill | 418 | 418 |
US |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 716 | 727 | 511
PP&E | 737 | 863 |
Right-of-use assets | 30 | 33 |
Intangible assets | 94 | 68 |
Other assets | 61 | 47 |
Goodwill | 45 | 46 |
Australia |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 158 | 160 | $ 165
PP&E | 424 | 490 |
Right-of-use assets | 4 | 4 |
Intangible assets | 34 | 37 |
Other assets | 71 | 76 |
Goodwill | $ 0 | $ 0 |

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